Gorman is out of the lineup for Monday's game against the Reds, John Denton of MLB.com reports.

Gorman had started in each of the Cardinals' last 29 games, but he could be headed for a steep reduction in playing time over the final two weeks of the regular season after St. Louis reinstated Nolan Arenado (shoulder) from the injured list Monday. With Arenado immediately slotting back into the lineup at his usual post at third base and with Willson Contreras (undisclosed) back in action Monday following a one-game hiatus, St. Louis now has its top options at the corner-infield spots available for the first time since late July.

The Cardinals activated Arenado (shoulder) from the 10-day injured list Monday. He'll start at third base and bat sixth in the Cardinals' series opener versus the Reds, John Denton of MLB.com reports.

Arenado needed nearly seven weeks to recover from a right shoulder strain, but he's been cleared to return to action after going 1-for-13 at the plate in four rehab games with Double-A Springfield. The 34-year-old should be used as the team's primary third baseman down the stretch, which is likely to result in a downturn in playing time for Nolan Gorman.

House is absent from the lineup for Monday's contest against Atlanta.

Paul DeJong started at third base Sunday versus the Pirates and contributed two doubles in three plate appearances, which has earned him another start at the hot corner Monday. House had started five straight and nine of 10 before sitting out back-to-back contests.

Lawlar started at third base and went 1-for-3 with a double and a run scored in Sunday's 6-4 win over the Twins.

Lawlar lined a double to left field and scored in the Diamondbacks' three-run fourth inning. Following an initial 0-for-11 run upon being called up in late August, Lawlar is batting .304 (7-for-23) with five doubles, three RBI, two steals and four runs scored over last eight contests. He hasn't been an everyday member of the starting lineup, but that could change in the short term after Blaze Alexander (elbow) was removed from Sunday's game. Testing on Alexander's elbow came back negative, but it was very swollen postgame, per Steve Gilbert of MLB.com. He'll undergo further testing Monday and is day-to-day heading into that night's series opener against the Giants. Lawlar stands to benefit from any time Alexander misses, as those two have shared third base since the beginning of the month.

Alexander suffered a left elbow contusion in Sunday's 6-4 win over the Rangers, Steve Gilbert of MLB.com reports.

Alexander was hit by a pitch in the top of the fourth inning, ultimately exiting the contest as a result. He appears to have avoided any significant damage, and the 26-year-old is considered day-to-day ahead of Monday's series opener with the Giants at home.

Alexander was removed from Sunday's game against the Twins after being hit in the left elbow by a pitch in the top of the fourth inning, Jack Sommers of SI.com reports. He finished 0-for-1 with a run scored.

Alexander appeared to be in significant pain after being hit, but he was able to take his base before checking out of the game in the bottom half of the inning. The Diamondbacks will likely send Alexander in for X-rays, but even if he avoids a fracture, he could be dealing with enough swelling or soreness to keep him out of the lineup for a few days. Alexander had settled into an everyday role for the Diamondbacks in the aftermath of the July 31 trade deadline, batting .250 with seven home runs, one stolen base, 21 runs and 22 RBI in 41 games since then.

Arenado (shoulder) will be activated from the 10-day injured list ahead of Monday's game against the Reds, Derrick Goold of the St. Louis Post-Dispatch reports.

The veteran third baseman has gone 1-for-13 during his minor-league rehab assignment with Double-A Springfield and will return to St. Louis on Monday after an absence of over six weeks due to a shoulder strain. Arenado is in the midst of the worst season of his career with a .245/.294/.366 slash line in 96 games.

Karros is out of the lineup for Sunday's game against the Padres.

Karros will hit the bench after he started in each of the last six games while going 2-for-20 with one walk and six strikeouts. Kyle Farmer will step in for Karros at third base and will bat seventh.

Muncy is out of the lineup for Sunday's game against the Giants.

The left-handed-hitting Muncy will be held out of the lineup for second time in four games while the Dodgers face off against another left-handed starter (Robbie Ray). Enrique Hernandez will fill in for Muncy at third base and will bat eighth.

Baty is out of the lineup for Sunday's game against the Rangers, Anthony DiComo of MLB.com reports.

It's the third baseman's fifth absence in New York's past six games, with all of those absences coming versus left-handed starting pitchers. Baty has been filling the strong side of a platoon at third base and has a .762 OPS through 10 games in September, which should be enough for him to retain that role despite the recent downturn in playing time.